Paint brushes



May 21, 1963 PAINT BRUSHES Filed Feb. 1, 1962 INVENTOR.

wah, & m

ATTQRNEYS R. L. WEISS ETAL 3,090,063

3,090,063 PAINT BRUSHES Robert L. Weiss and Earl R. Hunt, Wooster, and Howard C. Davis, Columbus, Ohio, assignors, by direct and mesne assignments, to The Wooster Brush Company,

Wooster, ()hio, a corporation of Ohio Filed Feb. 1, 1962, Ser. No. 170,318 3 Claims. (Cl. 15193) This invention relates to paint brushes and similar structures and particularly to means for attaching a solid brush handle to the bristle portion of a brush.

The invention has for its primary object the provision of a device :of the aforesaid nature which is characterized by its structural simplicity, its inexpensive manufacturing and operating costs, the ease of assembly of its parts, the attractive forms in which the device may be made, and the particularly effective manner in which it performs its function.

A more specific object of the invention is to provide a paint brush structure wherein the bristle receiving end of a brush handle is so formed as to mechanically interlock with a solidified bonding compound used for bonding the bristle portion of a brush to the handle thereof.

Further objects of the present invention and a number of its advantages will be referred to in or will be evident from the following description of one embodiment of the invention, said embodiment being illustrated in the accompanying drawings in which:

FIG. 1 is a front elevation of a brush constructed according to a preferred embodiment of the invention;

FIG. 2 is a side elevation of the brush as shown in FIG. 1;

FIG. 3 is a vertical fragmentary section taken along the line 33 of FIG. 2; and

FIG. 4 is a section taken along the line 44 of FIG. 3.

Before the device here illustrated is specifically described, it is to be understood that the invention here inuolved is not limited to the structural details or arrangements of parts here shown since paint brushes embodying. the present invention may take various forms. It also is to be understood that the phraseology or terminology herein employed is for purposes of description and not of limitation since the scope of the present invention is denoted by the appended claims.

Referring now to the drawings in all of which like parts are designated by like reference numerals, the embodiment of the invention as herein illustrated comprises a paint brush having a handle 40, a bristle portion 41, and a ferrule 42. The handle so in the form shown has a detachable gripping portion 43 having a reduced, threaded lower end portion 44 by means of which it is thread fitted into a rectangular, blocklike bristle receiving portion 45. The bristle portion 41 comprises closely packed bristles 46 having separation strips 47 adjacent their upper ends in the area of the bristle knot. The bristle knot is disposed substantially below the bristle receiving portion 45, and the ferrule 42 extends downwardly whereby the lower end thereof embraces the bristle knot. Said ferrule is preferably made of metal or like material and the lower end of the ferrule is provided With a pair of peripherally continuous, reinforcing ribs 48. The handle 40 as herein illustrated is made of wood but may be made of any suitable material such as plastic, metal, or the like.

As best shown in FIG. 3, the bristle receiving portion atent 3,090,053 Patented May 21, 1963 45 has a pair of downwardly converging apertures or bores 50 disposed one on either side of the detachable gripping portion 43. These apertures or bores 50 open at both the top and bottom surfaces of the bristle receiving portion 45 and are of substantial diameter whereby a bonding compound 51 disposed within the ferrule 42 above the bristle knot in sufficient amount rises upwardly into the obliquely directed apertures. Said bonding compound, in its solidified or cured state, is provided with a pair of upwardly diverging extensions 52 which, in eifect, provide a mechanical interlock between said bonding compound and the bristle receiving portion 45. Said compound also permeates the upper end portions of the bristles 46, and when solidified forms them into a solid bristle knot.

The bonding compound 51 may be of any suitable kind such as a thermosetting epoxide containing composition which may be cured at relatively moderate temperatures. Epoxy res-ins have the advantage that they adhere well to both wood and metal and that when cured they form a strong, rigid mass which mechanically interlocks with the apertures 50 of the bristle receiving portion 45.

It will be readily appreciated that the apertures 50 may be of any suitable or practical number and may be downwardly diverging as well as downwardly converging to effect the interlock desired. It will also be understood that the extensions 52 of the bonding compound 51 may completely fill the apertures 50 to afford a smooth, finished upper surface to the bristle receiving portion 45 thereby greatly enhancing its appearance. If desired, said apertures may be utilized for pouring the liquid compound into the ferrule 42 afiter the handle, ferrule, and bristle portion have been assembled.

In the present invention, a bristle receiving portion of a handle is provided affording oppositely obliquely directed bores within which is flowed a bonding compound which when cured adheres strongly to all of the surfaces that it contacts. In addition to the bonding effect, the oppositely obliquely directed bores actually mechanically lock the solidified bonding compound to the bristle receiving portion in such manner that even if there were no bonding effect, the two members could not be pulled apart. The recited bonding compound also provides means for uniting the upper end of the bristles into abristle knot as well as bonding a portion of the inner surface of the ferrule unitarily with the bristle receiving portion and the bristle portion.

It will be understood that many changes in the details of the invention as herein described and illustrated may be made without, however, departing from the spirit thereof or the scope of the appended claims.

What is claimed is:

1. A brush structure comprising a handle having a bristle receiving portion; a bristle portion connected at its upper end to the lower end of said bristle receiving portion; said bristle receiving portion having a pair of apertures therethrough open-ing at the top and bottom surfaces of said bristle receiving portion; said apertures converging in one vertical direction; and solidified bonding compound permeating the upper end of said bristle portion and extending upwardly into said apertures.

2. A brush structure comprising a handle having a bristle receiving portion; a ferrule surrounding said bristle receiving portion and extending downwardly therebelow; a bristle portion having a bristle knot; said bristle knot rule; said bristle receiving portion having a pair of aper tures therethnough opening at the top and bottom surfaces of said bristle receiving portion; said apertures converging in one vertical direction; and solidified bonding compound permeating said bristle knot and extending upwardly into said apertures.

3. A brush structure comprising a handle having a bristle receiving portion; a bristle portion connected at its upper end to the lower end of said bristle receiving portion; said bristle receiving portion having a pair of apertures therein opening at least at the bottom surface of said bristle receiving portion; said apertures converging in one vent-ioatl direction; and solidified bonding compound 1 permeating the upper end of said bristle portion and extending upwardly into said apertures.

References Cited in the file of this patent UNITED STATES PATENTS 247,247 Gruber Sept. 20, 1881 458,524 Engle Aug. 25, 1891 FOREIGN PATENTS 483,911 Italy Aug. 25, 1953 1,185,047 France Feb. 9, 1959 1,211,201 France Oct. 5, 1959 1,238,091 France June 27, 1960 

3. A BRUSH STRUCTURE COMPRISING A HANDLE HAVING A BRISTLE RECEIVING PORTION; A BRISTLE PORTION CONNECTED AT ITS UPPER END TO THE LOWER END OF SAID BRISTLE RECEIVING PORTION; SAID BRISTLE RECEIVING PORTION HAVING A PAIR OF APERTURES THEREIN OPENING AT LEAST AT THE BOTTOM SURFACE OF SAID BRISTLE RECEIVING PORTION; SAID APERTURES CONVERGING IN ONE VERTICAL DIRECTION; AND SOLIDIFIED BONDING COMPOUND PERMEATING THE UPPER END OF SAID BRISTLE PORTION AND EXTENDING UPWARDLY INTO SAID APERTURES. 